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Which of the following is true for plunger used in dial indicator?

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in Engineering Metrology by (829k points)
Which of the following is true for plunger used in dial indicator?

(a) It should never be greased or oil

(b) It should be greased monthly

(c) It should be oil or greased after every use

(d) It should be oiled weekly

I had been asked this question in an interview.

This intriguing question originated from General Care of Dial Gauges in section Dial Indicators and Indicating Gauges of Engineering Metrology

1 Answer

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Best answer
Right choice is (a) It should never be greased or oil

The best explanation: Oiling and greasing are not desirable in plunger of dial indicator. Oiling of plunger will only result in picking up of dust and sticking. The plunger should never be greased or oiled.

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